Grin ding-machine



(No Model.)

J. G. DELL.

GRINDING MACHINE. 'No. 393,145. Patented Nov. 20, 1 888 Q oibnemm n. PETERS. PhMo-Liihognpher. Wahingiuml). c.

' vention.

UNITED STATES PATENT QFFic E.

' JOHN G. DELL, OF PHILADELPHIA, PENNSYLVANIA.

GRINDIN G -MACHINE.

. SPECIFICATION forming part of Letters Patent No. 393,145, dated November 20, 1888.

Application filed March 12, 1888. Serial No. 266,976. (No model.)

To all whom it may concern:

Be it known that I, JOHN C. DELL,a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Grinding-Machines, which improvement is fully set forth in the following specification and accompanying drawings.

My invention relates to improvements in grinding-mills, and has for its object to provide improved means for adjusting the grinding cone or burr with relation to the shell to cause the mill to grind fine or coarse, and also to provide means for moving the cone away from the shell to allow the removal from the mill of obstacles or foreign matter-such as nails,stones,or the like-which may have been placed in the hopper with the material to be ground; and a further object is to provide an improved construction of grindingconeor burr.

For these purposes the invention consists of a pivoted lever having a clampingscrew and provided with an elongated slot, in which is a lug which is seen red to the casing and to which is attached the conical shell of the mill, and a second lever having the same pivotal point as the first lever and operated by a screw working in a bearing on the said first lever.

It further consists in the combinations of parts, as herein set forth and claimed.

Figure 1 represents a front elevation, partly sectional, of a grinding-mill embodying my in Fig. 2 represents a horizontal sectional view thereof. Fig. 3 represents a longitudinal sectional view of the grinding cone or burr.

Similar letters of reference indicate corresponding parts in the several figures.

Referring to the drawings, A designates a part of the stand or frame of the mill; B, the casing provided with the inletspout E, the exitor discharge spout F, and a depending pin or lug, F, the purpose of which will be explained.

G designates the driving shaft passing through the casing, so as to mount the same loosely thereon, and having the grinding cone or burr H secured thereto by means of the key It at its reduced end, and the spring-bar a and a guard or plate, h, at its enlarged end or head, as well known in the art. Said head is cut out or notched to receive the said bar and guard-plate. The grinding-cone comprises the outer or hard-metal portion, If", and the inner soft-metal portion, it, which hard portion is afterward cast upon the soft portion.

J designates the conical grinding shell, which receives the grinding-cone and is secured firmly to the casing.

From this construction it is evident that the grinding cone or burr is rigid on the drivingshaft and is revolved therewith, and the shell is secured to the casing, which is mounted loosely on the shaft and capable of lateral movement on said shaft to adjust the shell with relation to the cone, or to move it away from the same, as desired.

In order to move the grinding-cone away from the shell to enable obstacles or foreign matter to fall out of the mill, I employ a handlever, K, having its outer end pivoted at k to the frame, provided near its central portion with an elongated slot, k, to receive the depending lug or arfn F on the casing, and further provided near its outer end with a slot, k through which passes a binding-screw, k which enters a threaded opening in the frame; and in order to adjust the grinding-cone with relation to the shell I provide the lever L, which is pivoted above the lever K, the same pivot serving for both levers. The said lever L is cut out at Z to engage the depending lug F in the casing, and has its outer end in contact with an adj usting-screw, M, carried by the lever K.

This being the construction, the operation is as follows: The coffee or other material to be ground is placed in the hopper and the driving-shaft is revolved, the shifting-lever having been set in its normal position and the adj usting-lever being in its adjusted position to grind the coffee fine or coarse, as desired. Should it be discovered that an obstacle has been placed in the mill, it is merely necessary to throw the shifting-lever to one side, which moves the cone away from the shell,fand the obstacle will fall from the mill and thus prevent damage to the same.

The shifting-lever, it will be understood, is set in its normal or proper position, and. is only moved to clear the mill of obstructions, and the adj usti'ng-lever is moved or adjusted as desired to grind thematerial fine or coarse.

Having thus described my invention, what I claim as new,,and desire to secure by Letters Patent, is-

1. In a grinding-mill, the eombination,with the casing having a depending lug, of the shifting-lever pivoted to the frame, having an opening or slot to receive said lug, a slot to receive a binding-screw, which slot permits of the shifting of the lever, and an adjusting-la ver carried by the shifting-lever and engaging the lug on the casing, and the screw in the shifting-lever for moving the adj Listing-lever, all arranged and adapted to serve substantially as and for the purpose described.

2. In a grinding-mill, the combination of a frame with a driving-shaft journaled therein. a casing loosely mounted on said frame and havinga conical grinding'shell firmly secured thereto, and a depending lug, a lever, K, pivoted to said frame and provided with an elongated slot, 7c, in which the said lug is inserted, and a clamping-screw, k adapted to be inserted in the slot 7& of the said lever, a lever, L,with cut-out portion on its side,and the adjusting-screwM, working in a bearing on the lever K and adapted to bear against the said leverL, substantially as described.

3. A laterally-moving casing with shell and depending lug, a pivoted lever with slot and clamping device, a second lever with same pivotal point as the first, and an adjustingscrew secured to the first lever and adapted to operate the said second lever, substantially as and for the purpose set forth.

4:. In agrinding-mill, the combination, with the frame, the driving-shaft having the cone, and the casing mounted on the said shaft and carrying the shell, of a lever pivoted to the frame and adapted to engage the casing for shifting the same, an adj listing-lever engaging the casing having the same pivot as the shifting-lever, and means in the shifting-lever for engaging'the adjusting-lever to insure the proper adj ustmcntthereof, substantially in the manner and for the purpose described.

JOHN G. DELL. Vitnesses:

JOHN A. WIEDERSHEIM, \VM. N. Moonn.

Corrections in Letters Patent-N0. 393,145.

It is hereby certified that in Letters Patent No. 393,145, granted November 20, 18 88, upon the application of John 0. Dell, of Philadelphia, Pennsylvania, for an improvement-in fGrinding Machines, errors appear in the printed specification requiring the following corrections: Page 1, line 12, for cone or burr with relation to the shell read shell with relation to the cone or burr line 14:, for cone read shell; line 15, for

shell read e/me; lines 68 and 78, for grinding cone read shell; lines 69 and 79, for

shell read grinding cone and line 95, for cone away from the shell read shell away from the cone, and that the Letters Patent should be read with these corrections therein that the same may conform to-the record of the case in the Patent Oflice.

Signed, conntersigned, and sealed this 11th day of December, A. D. 1888.

H. L. MULDROW, First Assistant Secretary of the Interim".

[smn] Gountersigned:

BENTON J HALL,

Commissioner of Patents. 

